Influence of the B-site cation nature on dielectric properties of Ca 2 XBiO 6 (X = Dy, Fe, Al) double perovskite

For the synthesis of Ca 2 XBiO 6 (X = Dy, Fe, Al) metal oxides with ordered double-perovskite structure, the sol-gel auto-combustion method has been used for the first time. The synthesis progress was followed by the Fourier transform infrared spectroscopy and the samples structure was investigated by X-ray diffraction. The samples morphology was studied by means of scanning electron microscopy. The influence of the nature of the trivalent B-site cation on the dielectric properties was evaluated by resistivity measurements in vacuum at frequencies between 10 2 –10 5 Hz. The best dielectric behavior was obtained for Ca 2 AlBiO 6 and Ca 2 DyBiO 6 , while the best semiconductor behavior was found for Ca 2 FeBiO 6 .